G hindi ng-mill



(No Model.)

2 Sheets-Sheet 1.

D. C. STOVER.

AGRINDING MILL.

Patented Got. 8, 1882.

UTA/55555.', -NI/.ENTOR A TTOR/VEY (No Model.) 2 Sheets-Sheet 2.

D. C. STOVER.

GRINDINGMILL. NG. 265,289.

Patented Oct. 3,

WITNESSES:

' NVENTOR Pirna..

DANInLo. srovna, on rnnnronr, ILLINOIS.

GRlNDlNG-IVIILL.

. SPECIFICATION forming part of Letters Patent No. 265,289, dated October 3,1882,

Application tiled July 31, 1882.

To all whom it may concern:

Be it known that I, DANIEL C. STOVER, a resident of Freeport. in the county of Stephenson and State of Illinois, have invented certain new and usefulmprovements in Grinding-Mills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates toimprovements in that class of grinding-mills in which the power is applied to an outer cone by means of sweeps, andthe outer cone imparts a reverse rotary motion to an inner cone by means of intermediate gearing, the two cones having a common mathematical axis, and the grinding-teeth being on the inner and outer faces of the two cones respectively.

The details ot construction of the mill are set forth in the following specification, and shown in the accompanying drawings, and those features which constitute my invention are set up in the claims forming a part of the specification.

In the drawings, Figures l and 2 are included in Sheet 1, and Figs. 3 to 7, inclusive, in Sheet 2. Of these, Fig. lisa top view of the entire mill; Fig. 2, a vertical section of the entire mill through the line my, Fig. 1; Fig. 3, a horizontal section through the linem u, Fig. 2; Fig. 4, a plan of the inner cone as seen from below; Fig. V5, a View in perspee' tive of the center-post of the mill, the sleeve which rotates thereon, and the cog-wheel, and the cog-wheel attached to sleeve; Figs. 6 and 7, horizontal sections o f the center-post through lines M N and R S respectively.

The foundation of the mill is the horizontal base-plate B, consisting of `three arms radiating from a common center. At their central point is rigidly attached the center-post G, which is the axis of rotation of the mill, and may be formed integrally with the base-plate, or held in place by a key, b, as shown, or by other suitable means. About the lower p0rtion of the center-post Gr fits loosely a sleeve, F, formed integrally with or rigidly attached to a cog-wheel, E, at its base, and three pinions, D D D, of equal size, are pivoted to the respective arms of the base-plate at such dis- (No model.)

. tances from the center as to engage with the cog-wheel E. The sleeve F at its upper end is polygonal in form and fits looselyin a polygonal recess in the under surface of the inner cone, K, ofA the mill, which rests on the top of the sleeve, the connection of the sleeve and cone being such that anyv rotary motion of the sleeve is imparted to the cone atthe same time that the cone has suiicient rocking motion for adjusting itself to the outer cone. The cone K has grinding-teeth on its outer and upper surface, and the outer cone, C, is provided with corresponding teeth on its inner face. The cone G is pivoted at its vertex on the center-post Gr, and provided at its lower margin with an internal geared rim, either formed integrally with or attached rigidly to it, and this geared rim engages with the pinions D D D, so that the rotation ot' the outer cone rotates the inner cone, K, in a reversedirection, the motion being transmitted through the pinions D D D and cog-wheel andsleeve E F. The outer surface of the cone C extends upward in a neck for the reception of an ordinary hopper, V, and four radial arms, g, provided with grinding-teeth on their under faces and breaking-teeth on their upper faces, extendfrom the vertex of the cone to the inner circumference of the neck. Above the cone the center-post is flattened, as shown in Figs. 5 and 6, and a stationary cap provided with three breakingarms,f, and having at its center an opening corresponding to the flattened center-post, rests on the vertex of the cone and is held in position by the post. The arms f are provided with breaking-teeth on theirlower faces, between which the breakin g-teeth of the arms g pass when the shell U is rotated. The upper end of the center-post G is screw-threaded, and a wing-nut, c, serves to tighten or loosen the mill.

To the sides of the shell C are attached converging sweeps Z Z', connected at their rear ends by a cross-piece, Z", and a lug, o, projecting from the shell, enters the crosspiece Z{ and formsarigid connection for the sweeps and shell.

Immediately under the opening between the cones K and U is attached an annular meal- IOO trough, t, provided at one pointwith an opening in its bottom, through which the meal can escape, and a series of scrapers, l, at the lower margin of the cone K, bring the meal to this opening.

The base-plate B of the mill rests on a mealboX, A, of ordinary form, to which the arms B B B may be bolted, or fastened by other suitable means. The ends ofthe arms project beyond the sides of the box, and to them are fastened rodsl, which extend in lines tangent, or nearly so, to the periphery of the mill, and are staked, to the ground at their outer ends. The rods P may be bolted to the arms B, as shown, or the ends of thearms may be hooked in form and pass through eyes in the inner ends of the rods, or vice versa. The ordinary method of anchoringr mills of this class is to bolt them to the boxes on which they rest and stake the boXes to the ground.- The entire strain is thus thrown on the box, and itis practically impossible to make a box ot' suficient strength to bear it. By the use of the anchoring-rods l), as shown, the strain is thrown upon the mill almost entirely, and a very light box is found to be suicient.

The operation of the mill is evident. Power being applied to the sweep` ear-corn is placed in the hopper. The outer shell, (l, rotates in one direction and the inner shell, K, in the opposite direction. rlhe breaking-teeth t' o1' the arms g pass between the stationary breaking-teeth of the armsf, breaking the ear-corn into small pieces. 'lhese drop down between the arms g and are ground, first between the teeth ou the under surface of the arms g and the teeth on the upper surface of the cone K, and afterward between the finer grinding-teeth on the contiguous faces ot' the two cones. The meal drops down between the cones into the meal-trough t, from which it escapes into the mealbox A.

As already stated, the inner cone, K, has sutiicient rocking motion to permit its automatie adjustment to the outer cone. rlhe outer cone is held in place at its vertex by the eenter-post and at its rim by the pinions D D D, so that, except as to rotary motion, it is rigidly fixed. Vere the inner cone rigidly attached to the sleeve, there would be no possibility of lateral adjustment of the two cones; but the loose connection ot' the cone and sleeve allows the cone to adjust itself perfectly to the shell.

I am aware that a geared mill in which the inner and outer cones rotate in opposite directions is well known, and that many features ot' the construction of the mill here presented are old. v

What I claim asnew, however, and desire to secure by Letters Patent, is-

1. In a grinding-mill, the combination of an internally-geared outer gri ndin g-cone pivoted atits vertex upon a central vertical shaft, an extern ally-geared sleeve rotating upon said shaft, an inner grinding-cone hung on the vertex of said sleeve, and connected therewith by means adapted to impart rotary motion of the sleeve to the cone and yet permit rocking motion ot' the cone, anda series of pinions engaging with the gearing of said outer cone and sleeve and adapted to produce reverse rotary motion of said sleeve upon the rotation of said outereone, substantially as shown and described.

2. The combination of a sweepactuated grinding-mill, the meal-box on which it rests, and a series of anchoring-rods attached at one end to the stationary baseot' thcmill at points without the periphery of the meal-box and at the other to the ground by means ot' stakes, said rods being adapted to relieve the mealboX of the torsional strain generated bythe rotation of the sweeps, substantially as shown and described.

In testimony whereof [have signed this speciflcation in the presence of two subscribing witnesses.

DANIEL (l. STOVER.

fitnessen ltoie'r. Il. \VILEs, BoB'r. M. KEEvEr-z. 

